Melt 1/2 cup margarine in large saucepan.,Saute diced onions, add celery slices until tender.,Add water, potatoes and clams.,Bring to a boil slowly.,Turn heat down to simmer, continue cooking until potatoes are nearly done.,Grate 1/2 cup raw carrots.,In small saucepan, melt 1/4 cup margarine and flour.,Stir through until all margarine is absorbed.,Add milk.,Stir quickly over a medium heat until blended into a smooth mixture (a whisk does this easily).,Add this mixture and grated carrots to clam and vegetable mixture.,Stir gently to blend.,______